Method of producing a new hypochlorite composition



Patentea Dec. 30, 1 930 80 Drawing. orlglnel'application filed August 16,

' .Divi ded and this application filed March 6,

" concentration and UNITED STATES PATENT OFFICE POBATION OF VIRGINIA METHOD OI PRODUCING A NEW HY.

invention relates to improvements in the produotion of calcium hypochlorite compositions. This'application is a division of our copentlin application filed August 16th, 1928, Serial umber 300,148.

\Ve have found that under regulutecl (OH- ditions ina system' containing Na, Cu, ()Cl, and Cl ions there can be obtained an entirely new triple salt which, so for as we are aware, has not heretofore been known. It is a triple salt having a composition corresponding to the formulu Ca(()Cl) NaOGLNaClJQH O. It is easily identified not only by analysis but also by its crystalline form and optical properties. The crystals belong to the hexagonal tem and appear as right hexagonal prisms with each etl e bevelled. The crystals are anisotropic w ien viewed from the sitle soil isotropic when viewed from the ends "We have studied the aqueous equilibrium in the system including the four ions lilo, Cu, 001 and Cl and have found that the new triple salt can be protluooti by (lifien ent methods of procedure.

For example, if sodium chloride is ndtletl to a saturated solution of calcium hypo-- chlorite at tempertures of about 16 C, 0?. lower and the solution seeolcti With crystals of the triple suit, a large yieltl of the ccystale of this triple saltis clots-lineal,

The proportions in the example just given con be somewhat vurietl it being impoiitent to have the four ions together in sufiicient at e suiliciently low temperature so that the new triple suit will he obtained in a stable form,

The new triple salt is comparatively stable up to a temperature of about 22 U, at or about which temperature transformation into its constituent salts or hydrated salts The transformation is upparent to the eye or the touch as the ci'ystuls then lose their shape and become pasty. hen cooled again the new ttiple suit forms Pout slowly. While we have described. the salt as comparatively stable at temperatures below 22 0., it nevertheless eppeet's to umlei go a slow decomposition with evolution of oxygen and some chlorine, much tloes 1928, Serial No 53%,148, cool in iteiinunyii'uy 11,

undergoes e 7 ROBERT B. MACMIILLIN AND MAURICE C. TAYLOR, 616 NIAGARA FALLE, NEW YURZ'iI,

ASSIGNOBS TO THE MATHIESON ALKALI WORKS, INC., 61? NEW YQBK,

test s Silo. issure sodium hypochlorite under similei' conditions. ll1eciystuls of the new salt con, however, be dried at it low temperature without great decomposition and it kept below 922 C. with preservation of the general outlines of the crystals ciuriug the drying process, glV- iug u product which is somewhat grenulur in form and lighter in clensity than the lay llrntetl crystals.

The new triple compound or suit can i be employed for exanipie to! bleaching p poses where it is to he used; at the pluc is produced or bQiCtB it hes hurl an oppon tunity of umleigoing tlecompositionc I' (ii-(let to protect it against decomposition it should be maintained. at a low temperature.

The new triple selt forms a vuluelole inten mediate product for use in the preparation stable calcium hypochlorite finel precinct. W e have found that the soium hypoehlorite content this new triple selt cen lee converted into calcium hypochlorite to ioiin final calcium hypochlorite product ecimiizcti with sodium. ciiloside The tendency of the new tri le corn ountl to (lecoznnose e nee-rs 2's 1 pr to be due to the sodium hypochlorite which it contains in its crystalline stiuctmre Sotiiuno hypoclilozcite eithe hyclretecl or" tin-- hydrous is known to he chemically unste e under siinilei: conditions. We hove tout however, that the sodium hypochlorite lie e 'tninu eel ironi these crystals Without appreciable loss of ectivc chlorine by rep c-- io the sotiiuin of the sociium hypooh with culciuui give u final product cont ing approximately twice es much celciuin l pochlorite &S sodium chloride, in the celciuin hypochloi-ite product the e chlorine is in a stable form end the pirotloc o, vuluuble "product in other respects t loe hereineaitei' clescribetl,

the new ttiple cont i m u We claim:

The method of producing a new hypochlorite compound which comprises adding sodium chloride to a saturated solution of calcium hypochlorite at a low temperature to form a triple salt of calcium hypochlorite,

sodium hypochlorite and sodium chloride in crystalline form.

In testimony whereof we aflix our signatures.

ROBERT B. MACMULLIN. MAURICE C. TAYLOR. 

